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Hello from JustAnswer. This is Dr. Love.
Do you mean Cheratussin AC?
I had asked for clarification of the medicine that she has taken. If she has taken Cheratussin AC, then it would explain the positive result. The Cheratussin AC contains codeine, and codeine is metabolized into morphine in the body, which would cause a positive drug test for MOP (opiates).
If you mean a different medicine, then please clarify which medicine you mean.